From patchwork Tue Jun 29 02:39:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12349125 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DD99C11F65 for ; Tue, 29 Jun 2021 02:39:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C9E05619AB for ; Tue, 29 Jun 2021 02:39:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C9E05619AB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2C89F8D00F2; Mon, 28 Jun 2021 22:39:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 29EDC8D00F0; Mon, 28 Jun 2021 22:39:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1673F8D00F2; Mon, 28 Jun 2021 22:39:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0247.hostedemail.com [216.40.44.247]) by kanga.kvack.org (Postfix) with ESMTP id E3D0D8D00F0 for ; Mon, 28 Jun 2021 22:39:51 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id E6E398249980 for ; Tue, 29 Jun 2021 02:39:51 +0000 (UTC) X-FDA: 78305206182.01.9DE0784 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf22.hostedemail.com (Postfix) with ESMTP id 999EDC01C082 for ; Tue, 29 Jun 2021 02:39:51 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 8B867611AE; Tue, 29 Jun 2021 02:39:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1624934390; bh=RnbB1nQtKYNDI4Qndnf9HjT8r1vpT8GBVkvfYMtW6JE=; h=Date:From:To:Subject:In-Reply-To:From; b=OeTJkNayP9mj8XD/jljjqy3CTOkiSU3+qy1vkgNaHvYLUugc+pnPb2uKbLtSIJsdh Iw+vtvkObkLF5jOlO/TVDfEaeibhP9CR58JXcBxtW9gWHNFDagdDrOfmbjjIUHHsK+ KuV7D763Eo0AReDj6CHGZyPVFxr7vYGIgL1n2dY8= Date: Mon, 28 Jun 2021 19:39:50 -0700 From: Andrew Morton To: akpm@linux-foundation.org, david@redhat.com, dbueso@suse.de, geert@linux-m68k.org, ldufour@linux.ibm.com, Liam.Howlett@Oracle.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 125/192] mm/memory.c: use vma_lookup() in __access_remote_vm() Message-ID: <20210629023950.8-KUe7QK5%akpm@linux-foundation.org> In-Reply-To: <20210628193256.008961950a714730751c1423@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=OeTJkNay; spf=pass (imf22.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Stat-Signature: bg7enhzykno9ofphxxm7cpshux4pqhg4 X-Rspamd-Queue-Id: 999EDC01C082 X-Rspamd-Server: rspam06 X-HE-Tag: 1624934391-611047 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Liam Howlett Subject: mm/memory.c: use vma_lookup() in __access_remote_vm() Use vma_lookup() to find the VMA at a specific address. As vma_lookup() will return NULL if the address is not within any VMA, the start address no longer needs to be validated. Link: https://lkml.kernel.org/r/20210521174745.2219620-22-Liam.Howlett@Oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Laurent Dufour Acked-by: David Hildenbrand Acked-by: Davidlohr Bueso Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/mm/memory.c~mm-memoryc-use-vma_lookup-in-__access_remote_vm +++ a/mm/memory.c @@ -4994,8 +4994,8 @@ int __access_remote_vm(struct mm_struct * Check if this is a VM_IO | VM_PFNMAP VMA, which * we can access using slightly different code. */ - vma = find_vma(mm, addr); - if (!vma || vma->vm_start > addr) + vma = vma_lookup(mm, addr); + if (!vma) break; if (vma->vm_ops && vma->vm_ops->access) ret = vma->vm_ops->access(vma, addr, buf,